/*
 * Copyright (C) 2010 Herve Quiroz
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 * 
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
 */
package org.trancecode.xproc;

import com.google.common.collect.ImmutableMap;

import java.util.Map;

import org.trancecode.collection.TcMaps;
import org.trancecode.function.TcSuppliers;

/**
 * @author Herve Quiroz
 */
public final class ImmutablePipelineContext extends AbstractPipelineContext
{
    public static ImmutablePipelineContext copyOf(final PipelineContext context)
    {
        if (context instanceof ImmutablePipelineContext)
        {
            return (ImmutablePipelineContext) context;
        }

        if (context instanceof AbstractPipelineContext)
        {
            return new ImmutablePipelineContext(((AbstractPipelineContext) context).getProperties());
        }

        throw new IllegalArgumentException(context.getClass().getName());
    }

    ImmutablePipelineContext(final Map<String, Object> properties)
    {
        super(ImmutableMap.copyOf(properties));
        executor = TcSuppliers.memoize(executor);
        inputResolver = TcSuppliers.memoize(inputResolver);
        outputResolver = TcSuppliers.memoize(outputResolver);
        pipelineLibrary = TcSuppliers.memoize(pipelineLibrary);
        processor = TcSuppliers.memoize(processor);
        stepProcessors = TcSuppliers.memoize(stepProcessors);
        uriResolver = TcSuppliers.memoize(uriResolver);
    }

    ImmutablePipelineContext withNewEpisode()
    {
        return new ImmutablePipelineContext(TcMaps.copyAndPut(properties, PROPERTY_EPISODE, new Episode()));
    }
}
